I've recently updated to ios7 on my iphone and duolingo hasn't been allowing me to login.
There is one. It should be version 2.1
I've been having problems accessing my language tree. It just shows a white loading screen. I already have the most recent update.
iphone 5, ios 7, Version 3.0.1 = white screen can not login. Tried both facebook login and standard. Rebooted phone. Re-installed app. Changed password via web. Still can not login via iphone :-(